Is this a 'SIM PIN'? If so, go to settings - phone - SIM PIN and turn it to off.
Why do I keep having to reenter the SIM code after each iOS update?
Is this a 'SIM PIN'? If so, go to settings - phone - SIM PIN and turn it to off.
Is this a 'SIM PIN'? If so, go to settings - phone - SIM PIN and turn it to off.